Add shopt for bash

Author: LegNeato

.github/workflows/ci.yaml

@@ -157,9 +157,9 @@ jobs:
       - name: Rustfmt
         run: cargo fmt --all -- --check
       - name: Rustfmt compiletests
-        run: rustfmt --check tests/compiletests/ui/**/*.rs
+        run: shopt -s globstar && rustfmt --check tests/compiletests/ui/**/*.rs
       - name: Rustfmt difftests
-        run: rustfmt --check tests/difftests/pipelines/**/*.rs
+        run: shopt -s globstar && rustfmt --check tests/difftests/pipelines/**/*.rs
       - name: Check docs are valid
         run: RUSTDOCFLAGS=-Dwarnings cargo doc --no-deps
       - name: Check docs for `spirv-std` and `spirv-builder` on stable (for docs.rs)